Raise it up a li'l bit just so it soaks up the bumps better. Don't raise it up until it rides with the shocks fully extended because you want suspension travel in both directions. Run a harder spring in the front and softer in the rear andharder front tire inserts and soft rears. the stiffer front and harder rear will help keep rear traction and makeit more controlable. It could be a problem with downforce. The body you run makes a massive difference in handling on these little cars. That is why racers find one good handling body then they all use it. A racing body will really make any 1/10 handle a heck of a lot better than say a mini cooper body or even worse an El camino or truck body. Use the rear wing.. even if you don't like it bolt it on. The wing will keep the rear end planted at just about any speed over 10mph. If you want serious high speed traction get an outlaw Lola GTP (kinda like a wedge shape) body for your TC3. Unreal downforce on those.